diff --git a/contrib/teamcity/setup-debian-buster.sh b/contrib/teamcity/setup-debian-buster.sh
--- a/contrib/teamcity/setup-debian-buster.sh
+++ b/contrib/teamcity/setup-debian-buster.sh
@@ -81,7 +81,7 @@
 
 # Install llvm-8
 apt-key add "${TEAMCITY_DIR}"/llvm.pub
-add-apt-repository "deb http://apt.llvm.org/buster/   llvm-toolchain-buster-8  main"
+add-apt-repository "deb https://apt.llvm.org/buster/   llvm-toolchain-buster-8  main"
 apt-get update
 
 LLVM_PACKAGES=(